Stop mechanism for fly frames



March 14, 1950 M. CARRETTE STOP MECHANISM FOR FLY FRAMES 2 Sheets-Sheet 1 Filed Nov. 4, 1946 Mmumcc CAERi mv NTQa QM K -26... R'r'r'y.

March 14, 1950 M. CARRETTE 2,500,343

STOP MECHANISM FOR FLY FRAMES Filed Nov. 4, 1946 Z'SheetS-Sheet 2 Mm: m

\ N TQK Patented Mar. 14, 1950 STOP MECHANISM FOR FLY FRAMES Maurice Carrette, Lille, France, assignor of onehalf to Societe Le Blan & Cie, Lille, France, a

French company Application November 4, 1946, Serial No. 707,680

' In France April 23, 1946 6 Claims. 1

When a sliver or strand is broken during the operation of a fly frame, it generally. becomes entangled in the adjoining slivers, causes other snappings and in the majority of cases leads to important trouble in the running of themachine.

It is well known that those slivers are fragile, that their consistence is very weak and that it is not possible to apply pressure to them without causing them to break up. That is why the majority of known knocking off devices using feelers which come into contact with the sliver could not be applied to fly frames.

It is however highly desirable to be able to halt the frame as rapidly as possible after a sliver has snapped; that is why the workers controlling those machines have to lose a great deal of their time supervising the running and to be ready to intervene at once should a sliver snap.

Furthermore, as fly frames generally work with double slivers, that is to say two slivers rolled at the same time so as to combine to form only one, it sometimes happens that onl'yone sliver is being worked and the final result or single is thus defective.

It so happens that the staff often fail to observe the incident or hits upon it only a rather long time after the occurrence. The operators are then obliged to lose a good deal of time in remedying the failures produced by the machine.

It has already been proposed to cause the sliver to pass before the suction inlet of a fan in such a way that when a sliver snaps, the material of which it is composed is at once drawn in the fan and is thus unable to get entangled with the neighbouring slivers. Should a single occur, it is likewise drawn into the suction inlet after a very short while.

The object of the present invention is a stopping mechanism for fly frames comprising, in combination, a suction device of the type mentioned above and means for automatically stopping the fly frame without any interference by the staff, as soon as a sliver snaps .or if a single is produced.

The improved stopping mechanism comprises also a signalling device giving warning of the stoppage of the machine. By being warned in such a manner, someone of the stafi can at once see to the snapping or to the single and then set the machine running again. The workers in charge no longer need to have any fear of breakage or of defects that have not been perceived very rapidly; and their time and attention may be reserved entirely for productive work.

Other features of the invention will appear from the following description.

In the accompanying drawings:

Fig. 1 is an elevation view, with parts broken away, of a stopping mechanism in accordance with the invention;

Fig. 1 is a partial plan view of the device corresponding to the position shown in Fig. 1.

Fig. 2 is a partial view of the device when the frame has been stopped;

Fig. 3 shows a modification;

Figs. 4, 5 and 6 show another modification in three successive stages of operation.

Figs. 7 and 8 show further embodiments of the invention.

As shown in Figs. 1 and 2, the slivers or strands I delivered by the cylinders 2 are wound upon the bobbins 3 after passing in front of the inlet openings 4 of a suction pipe 5 connected to a fan 6 through a cylinder 1. A perforated piston 8 adapted to move in said cylinder carries a piston rod 9 provided with an enlarged flat part 9' and which is pivotally connected at Ill with a lever ll oscillating around a fixed axis I! of a mercury or other switch 13. The switch [3 is arranged in the circuit I4 of a coil l5 adapted to raise and release a bar 16 which is normally blocked by a stop member I! and pivotally connected at I8 to a bell crank lever l9. The lever 19 is pivoted around a fixed axis 20 and is urged in the direction of the arrow T for instance, by a counterweight 2|, a spring or any other equivalent device.

The vertical arm of lever I9 is adapted to push to the right a shoulder 22 fixed on a releasebar 23 carrying a fork 24 used to shift a power belt -not shown-from a fixed pulley 25 on to a loose pulley 26 and vice versa.

The device is completed by a lever 2! oscillating around a fixed axis 28. This lever is hinged by means of a slot on a pin 29, carried by the bar 23. Its lower end embraces the cylindrical part of the piston rod 9 with two legs 21' and 21", a pawl 3| being hinged on an axis 30 carried by the leg 21, one end of pawl 3| forms a hook 32, intended to cooperate with a lateral projection 33 on the enlarged part 9' of the piston rod 9, while the heel of the lever cooperates with a cam member 34 fastened to the bottom of cylinder 1.

The operation is as follows: when a sliver l breaks, the material delivered by the cylinder 2 is at once drawn by the fan 6 and is thus unable to become entangled with the adjacent slivers. Should a single occur, after a very short lapse of time this also is drawn into the pipe 5.

The piston 8 is interposed in the suction circuit and when the material enters that circuit it stops up the holes in the piston. Suction by the fan thus results in a difference of pressure on the opposite faces of the piston and the latter moves to the left as shown by arrow 1 As the rod 9 pushes on the lever II it closes the electric circuit M by rocking the mercury switch l3 (Fig. 2). The electric circuit l4 being closed, the electro-magnet I5 is energizedand it raises the bar IE which is thus set free'from the locking member H; the :bell crank lever 19 is released and under the action of weight'zl it causes the bar 23 to move to the right as shown by arrow f causes the driving belt on the fixed pulley. 25.to pass on to the loose pulley 26. The fly frame is thus caused to stop.

The closing of the electric circuit and/or the displacement of. the belt will simultaneously start a signal by any desired means such as an electrosignal diagrammatically shown at S. in series "in the=elcctric circuit M. Thesignal may be either mechanical, at-fixed. or blinking light, some sound signal or even those three at the same time soas to :attract theL-Qperators-attention and :to indicate the stoppageofthe machine. It also shows him:.the particular machine that has stopped when there is a group of similar machines.

In the latter part of the movement of bar 23 to the right, the piston-8 is drawn further inward- 1y by the lever 2128.5 itcomesinto contact with the enlarged part9" of the piston rod 9 (see Fig. 1 and Fig. 2) and finally, it partially moves past the suction aperture 35. All thefibers accumulated-on the forward? face of the piston are then dragged into the aperture 35 so as-to clearthe piston.

When the operator has'fastened the broken sliver l or' hasremoved the single, he sets the machine runningagain; to do this, he pushes the release bar-23 to the left. The lever 2"! oscillating around the fixed axis '28, will thus displace to the right the pawl'3l,'32 which has then engaged the lateral projection 33 on the enlarged part of 9 of piston 'rod 8. The piston is thus returned to the position it occupied in Fig. 1 and is thus ready for a further operation. At the end of the return movement, the heel of pawl '31 moves along the cam34 whichrocks and is released from the projec'tion 33. The piston'will then be able to-move again to the left as soon as another breakage-of a sliver occurs.

In the modification shown in Fi 3,.the electromagnet l5 mentioned above .is controlled by means of an adjustable differential manometer 36 cooperating with electric contacts 31, 38 arranged in the circuit I4 of the electromagnet. The manometer is operated by therdifierence between the pressures. exerted on the opposite faces of the-piston- 8, its two branches 39, being in communication with the chambers 41 and 42 of the'cylinder. When asliver snaps, the difference ofjtpressure increases and the-:circuit I4 is closedvwh reby the electromagnet i5 is caused to act as explained'above.

Figs. 4 to .fishowanother modification in which a perforated partition or flap 9a c'an swing around an axis 43 in a casing 44, the side faces of which are parallel whereas the lower surface 45 is cylindrical and coaxial with pivot 43. The casing 44 is in communication at 45 with the suction pipe'35 described above.

.Onthe, pivot 43 issecureda supportingmem- Said bar by meanslof the fork.24

.by the counterweight, as shown by arrow ,1", and

the flap 9a is thus caused to rock beyond the pointAG under the action of a dog 23' fixed on "the bar:23, so;-as to .be cleared from the accumulated' sliver (Fig. 6). When the operator sets the .machine to work again, the flap 8a is brought to 1 its original position.

In the modification shown in Fig. 7, the switch H which can oscillate around an axis 5!), is connected by a link 5i to a two arm lever '52 which oscillatesiaroundanzaxis=53. -At 54; that lever is connectedrt'othe bell 55 of a" vacuum meter. moving' vertically invaitank 56 which forms 'a hydraulic joint. A tube 51 is used to connect the inside -ofthe bell fifi with'the forward chamber 42 incylinder 1.

"WhBn'a' sliver snaps, the holes in the piston 8 become clogged as described-above and the pressure inlithe chamber 42 of the cylinder! is increased. The suction is. decreased under the "bell 55 and the letter rises. Thelever 52 rocks in the direction shown by the arrow {3 and the switch l3 closes, whereby the fly frame is caused to. stop.

Theconstruction shown in Fig. 8 is the same as that shownin Fig. 7 with the'exception that the reciprocating piston 8 is replaced by a swinging partition or flap-9a as described above with reference to Figs. 4 to *6. The lever 47 secured on the axis 43 of the flap 9a is provided with a pin 48 moving ina slot 59 provided in a sleeve secured on the belt shifting bar 23.

The piston 8 or the flap 9a can be a perforated plate or it may be madeof metallic netting, of cloth or of any other substance pervious to air.

Having now described army-invention what I claim as .new .and desire to secure by Letters Patent is:

1. In a fiy frame. for working slivers and the like, a stop mechanism comprising suction means adapted to create a fiuid stream, a suction pipe connected with saidsuction means and, provided with openings before which said slivers are adaptedtopass in close relation, a perforated partition-between said suction means and said suction pipe and adapted to be clogged by said slivers when brokenso as to cause a variation of pressure of said stream, stopping means for the frame and controlling means for operating said stopping means under the action of said variation of pressure.

2.. In a fly frame for working slivers and the like, a stop mechanism comprising suction means adapted to create a fluid stream, a suction pipe connected with said suction means and provided with openings before which said slivers are adapted. to. pass in close relation, a movable perforated partition between said suction means and said suction pipe and adapted to be clogged by said slivers when broken so as to cause a variation of pressure of said stream, controlling means operated by said variation of pressure, means operatively connected to said controlling means and adaptedto cause said movable partition to be brought in a retracted position for allowing the communication 'between said suction means and suction pipe and stopping means for the frame operated by said controlling means.

3. A stop mechanism for fly frames, as claimed in claim 2, in which said movable partition is a reciprocating piston.

4. A stop mechanism for fly frames, as claimed in claim 2, in which said movable partition is an oscillating flap 5. A stop mechanism for fly frames, as claimed in claim 1, in which said stopping means comprise an electromagnet for actuating thereof and said controlling means comprise a differential manometer the two branches of which are respectively in communication with chambers located on the opposite faces of the partition and provided, with electric contacts arranged in the circuit of said electromagnet.

6. A stop mechanism for fly frames, as claimed in claim 1, in which said stopping means comprise an electromagnet for actuating thereof and 20 said controlling means comprise a switch, a vacuum-meter operatively connected with said switch and in communication with the forward face of the partition, said switch being arranged in the circuit of said electromagnet.

MAURICE CARRETTE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,077,525 Mennesson Apr. 20, 1937 2,206,834 Burkholder July 2, 1940 FOREIGN PATENTS Number Country Date 25,796 Great Britain of 1909 851,546 France Oct. 2, 1939 

